(19)
(11) EP 0 410 142 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.02.1992 Bulletin 1992/08

(43) Date of publication A2:
30.01.1991 Bulletin 1991/05

(21) Application number: 90111881.0

(22) Date of filing: 22.06.1990
(51) International Patent Classification (IPC)5: C07D 213/79, C09K 19/34, C07D 213/64, C07D 213/65, C07D 237/24, C07D 237/14, C07D 239/28, C07D 239/26, C07D 239/34, C07D 241/24, C07D 241/12, C07D 241/18, C07D 213/80
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 23.06.1989 JP 161065/89
31.08.1989 JP 225198/89

(71) Applicant: MITSUBISHI PETROCHEMICAL CO., LTD.
Chiyoda-ku Tokyo (JP)

(72) Inventors:
  • Saito, Masaki, c/o Mitsubishi Petrochem.Co.,Ltd.
    Ibaraki (JP)
  • Takeda, Makoto, c/o Mitsubishi Petrochem.Co.,Ltd.
    Ibaraki (JP)
  • Wada, Noriko, c/o Mitsubishi Petrochem.Co.,Ltd.
    Ibaraki (JP)
  • Inui, Shiroh, c/o Mitsubishi Petrochem.Co.,Ltd.
    Ibaraki (JP)
  • Taniguchi, Hiroshi, c/o Faculty of Engineering
    Fukuoka-shi, Fukuoka (JP)
  • Isomura, Kazuaki, c/o Faculty of Engineering
    Fukuoka-shi, Fukuoka (JP)
  • Maruyama, Nobuyoshi, c/o Faculty of Electr.
    1-chome, Choufu-shi, Tokyo (JP)
  • Seo, Shoichi, c/o Mitsubishi Petrochemical Co.,Ltd
    Ibaraki (JP)
  • Iwane, Hiroshi, c/o Mitsubishi Petrochem. Co.,Ltd.
    Ibaraki (JP)
  • Kawano, Shin, c/o Mitsubishi Petrochem. Co.,Ltd.
    Ibaraki (JP)

(74) Representative: Hansen, Bernd, Dr. Dipl.-Chem. et al
Hoffmann, Eitle & Partner Patent- und Rechtsanwälte, Postfach 81 04 20
81904 München
81904 München (DE)


(56) References cited: : 
   
     
    Remarks:
    The title of the invention has been amended (Guidelines for Examination in the EPO, A-III, 7.3).
     


    (54) Optically active liquid crystal compounds


    (57) An optically active compound represented by formula (I):


    wherein R¹ represents an alkyl group having from 6 to 18 carbon atoms or an alkoxy group having from 6 to 18 carbon atoms; A represents


    represents a nitrogen-containing hetero-aromatic ring; n and m each represents 0 or 1; R² represents an alkyl group having from 1 to 12 carbon atoms; and C* is an asymmetric carbon atom. The compound of formula (I) exhibits excellent physicochemical stability, a low temperature range for the chiral smectic C phase when used either alone or in combination with other compounds, and a rapid response.





    Search report